* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 4px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    padding: 80px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content {
    display: contents;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    display: inline-block;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.code-window {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.window-header {
    background: rgba(0, 0, 0, 0.4);
    padding: 10px 15px;
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #ff5f56;
}

.dot.yellow {
    background: #ffbd2e;
}

.dot.green {
    background: #27c93f;
}

.code-window pre {
    padding: 20px;
    color: #e0e0e0;
    font-size: 0.95rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
}

.code-window code {
    line-height: 1.5;
}

/* About Section */
.about {
    padding: 80px 20px;
    background-color: var(--light-bg);
}

.about .container {
    max-width: 900px;
}

.about h2,
.skills h2,
.projects h2,
.experience h2,
.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-dark);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-light);
    line-height: 1.8;
    font-size: 1.05rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.stat h3 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat p {
    color: var(--text-light);
    font-weight: 600;
}

/* Skills Section */
.skills {
    padding: 80px 20px;
    background-color: white;
}

.skills .container {
    max-width: 900px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.skill-category h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.skill-tag {
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: var(--primary-color);
    color: white;
}

/* Projects Section */
.projects {
    padding: 80px 20px;
    background-color: var(--light-bg);
}

.projects .container {
    max-width: 1000px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.project-header {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.project-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.project-tech span {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Experience Section */
.experience {
    padding: 80px 20px;
    background-color: white;
}

.experience .container {
    max-width: 800px;
}

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--border-color);
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.timeline-item:nth-child(even) .timeline-content {
    order: -1;
}

.timeline-date {
    text-align: right;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
    padding-top: 0.5rem;
}

.timeline-item:nth-child(even) .timeline-date {
    text-align: left;
}

.timeline-content {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.timeline-item:nth-child(even) .timeline-content {
    border-left: none;
    border-right: 4px solid var(--primary-color);
}

.timeline-content h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 0.3rem;
}

.company {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.timeline-content p:last-child {
    color: var(--text-light);
    line-height: 1.6;
}

/* Contact Section */
.contact {
    padding: 80px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.contact .container {
    max-width: 600px;
}

.contact h2 {
    color: white;
}

.contact-subtitle {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.1rem;
    opacity: 0.95;
}

.contact-form {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
}

.contact-form .btn {
    width: 100%;
    text-align: center;
}

.contact-links {
    text-align: center;
    margin-top: 2rem;
}

.contact-links p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.contact-links a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.3s ease;
}

.contact-links a:hover {
    opacity: 0.8;
}

/* Footer */
.footer {
    background: var(--dark-bg);
    color: #94a3b8;
    padding: 2rem 20px;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
    }

    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        grid-template-columns: 80px 1fr;
        gap: 1rem;
    }

    .timeline-item:nth-child(even) .timeline-content {
        order: 0;
    }

    .timeline-date {
        font-size: 0.85rem;
        text-align: left;
        padding-left: 2rem;
    }

    .timeline-item:nth-child(even) .timeline-date {
        text-align: left;
    }

    .timeline-content {
        border-left: 4px solid var(--primary-color);
        border-right: none;
    }

    .timeline-item:nth-child(even) .timeline-content {
        border-left: 4px solid var(--primary-color);
        border-right: none;
    }

    h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-brand {
        font-size: 1.2rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
}